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A section of a graph obtained by finding its intersection with a plane.

An element of order 2 in a group (i.e., an element A of a group such that A^2=I, where I is the identity element).

A type of integral named after Henstock and Kurzweil. Every Lebesgue integrable function is HK integrable with the same value.

The integral associated with the Haar measure.

The vectors +/-a_1, ..., +/-a_n in a three-space form a normalized eutactic star iff Tx=x for all x in the three-space.

The sporadic group HJ, also denoted J_2.

A system of variables which can be written in the form of Hamilton's equations.

The rules for the multiplication of quaternions.

A polynomial function of the elements of a vector x can be uniquely decomposed into a sum of harmonic polynomials times powers of |x|.

A database accessed by one or more hash functions.